package person.drf.shop.product.jucTest;

import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.CopyOnWriteArraySet;

public class NosafeDemo {
    public static void main(String[] args) {

        //Map<String,String> map = new HashMap<>();
        //Map<String,String> map = Collections.synchronizedMap(new HashMap<>());
        Map<String,String> map = new ConcurrentHashMap<>();
        for (int i = 1;i <= 50;i++) {
            new Thread(()->{
                map.put(Thread.currentThread().getName(),UUID.randomUUID().toString().substring(0,8));
                System.out.println(map);
            },i+"").start();
        }

    }

    private static void SetNoSafe() {
        //Set<String> set = new HashSet();
        //Set<String> set = Collections.synchronizedSet(new HashSet<>());
        Set<String> set = new CopyOnWriteArraySet<>();


        for (int i = 1;i <= 30;i++) {
            new Thread(()->{
                set.add(UUID.randomUUID().toString().substring(0,8));
                System.out.println(Thread.currentThread().getName()+"--"+set);
            },i+"").start();
        }
    }

    private static void ListNoSafe() {
        //List<String> list = new Vector<>(); // ArrayList<>();
        //List list = Collections.synchronizedList(new ArrayList());
        List list = new CopyOnWriteArrayList();

        for (int i = 1;i <= 30;i++) {
            new Thread(()->{
                list.add(UUID.randomUUID().toString().substring(0,8));
                System.out.println(Thread.currentThread().getName()+"--"+list);
            },i+"").start();
        }
    }
}
